I am the IT Director at our school. We were having DFS replication issues (replication simply was not happening), so I deleted the namespace entirely, then rebuilt the namespace. There is still no replication going on! The basics are as follows: We have three sites: DO, RE, & HS. Each site has a domain controller running 2008 R2. There servers where the namespace resides were initially running 2008 R2 before problems began, but I now have them all on 2012.